Abstract: The objective of this paper is to empirically examine the importance of the structure of agglomeration on productivity and growth. To accomplish this we will include the degree of co-agglomeration of similar industries as an explanatory variable in the empirical analysis, while simultaneously controlling for the degree of industry-specific agglomeration. To the best of our knowledge, the impact of co-agglomerated industries on productivity has not previously been investigated. The empirical analysis confirms a positive statistical relationship between interdependent and co-located industries on labour productivity.